Unlike images produced by a convex spherical mirror, images produced by concave spherical mirrors a. are always going to be displayed upright, not inverted. b. can be real or virtual depending on the object's placement. c. are located only by the mirror. d. are always going to be virtual.

a.   mass number from atomic number

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

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